I accidentally saw about twenty minutes of the movie before reading Gone Girl. Since it was towards the end of the movie, I thought I had spoiled the ending for myself. Although something major was revealed, the story was still really interesting. It was absolutely crazy how someone could plan everything out like that! I read Dark Places by Gillian Flynn first so I knew how dark and twisted her writing can be, but I think Gone Girl is crazier. If you haven't picked it up yet and love thrillers, I highly recommend!